Diameter-gage for lathes.



No. 773,196. PATENTDD 00T. 25, l1904. N. D. DHARD.. DIAMETER GAGE FOB. LATHBS.

APPLICATION FILED .TUNE 17, 1904.

Ho MODEL.

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UNITED STATES Patented October 25, 1904.

PATENT OEErcE.

NICHOLAS D. CHARD, OF CINCINNATI, OHIO, ASSIGNOR TO THE LODGE 8:

SHIPLEY MACHINE TOOL COMPANY, OF CINCINNATI, OHIO, A COR- PORATION.

DIAMETER-GAGE Fon LATHEs.

SPECIFICATION forming part of Letters Patent No. 773,196, dated October 25, 1904.

Application filed June 1'7, 1904. Serial No. 213,028. (No modeLl To @ZZ wit/)711, it may concern:

Be it known that I, NICHOLAS D. CHARD, a citizen of the United States, residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Diameter-Gages for Lathes, of which the followingI is a specification.

My invention relates to a diameter-gage for the tool-post of an engine-lathe or similar machine.

The features of my invention are more fully set forth iu the description of the accompanying drawings, forming a part of this specification, in whicl Figure 1 is a top plan view of the improvement. Fig. 2 is a central vertical section on line fr fr, Fig. 1. Fig. 3 is a section on line fw w, Fig. 2. F ig. et is a detail plan View of the gage. Fig. is a plan view showing the arrangement of screw-shaft and stops for the rear tool-post.

The object of the invention is to produce a diameter-gage which can be set to turn a predetermined diameter and which will automatically limit the travel of the tool-post toward the machine centers at such predetermined point.

I. have only shown a portion of the carriage and tool-post, it being understood that these are of conventional type with the carriage reciprocating on the longitudinal ways of the lathe-bed and the tool-post of whatever specific form reciprocating' on the transverse gibbed way of the carriage.

1 represents the carriage.

2 represents the tool-post. The tool-post is provided with the transverse channel 3. (See Fig. 2.)

L represents the ordinary cross feed-screw journaled in the carriage and having a screwthreaded engagement with the tool-post, so as-to reciprocate the same on the carriagecrossway 7.

5 represents a handle for operating the cross feed-screw.

6 represents a tool-post on the rear of the carriage, this being a use permissible with my invention.

9 represents a gage-screw shaft inserted in the channel 3.

8 represents a journal-bracket erected on the front edge of the carriage, through which projects the front and non-screw-threaded end of the screw-shaft 9. The front end of the screw-shaft9 is reduced in diameter, and upon this end is Ioosely fitted the sleeve 10, journaling in the bracket 8.

11 represents a knurl carrying the sleevegage 12, the two being keyed or pinned to the sleeve 10, so asto turn therewith. The gagesleeve 12 is revoluble, while the bracket 8 is stationary, constituting a gage.

13 represents a nut on the end of the screwshaft 9 for clamping the sleeve and knurl to the screw-shaft 9. Sleeve 12 is provided with standard gage graduations 111 and the periphery of the bracket 8 with an index-finger or indicator 15.

16 represents a sleeve eXteriorly screwthreaded into the front end of the channel 3 of the tool-post 2. The screw-shaft 9 passes loosely through sleeve 16. The end of the screw-shaft9 is provided witha boss 17, which bears inthechannel 3 to steady the end of the screw-shaft 9.

18 represents a sleeve-nut, through which screw-shaft 9 passes, having screw-threaded engagement with the interior. The sleeve 18 is loosely fitted into the channel 3, so as to freely travel therein, and it is keyed to channel 3 of the tool-post 2, so as to travel within the channel longitudinally, but without rotation. It is obvious that as the knurl 11 is rotated in either direction the sleeve 18 will be longitudinally adjusted in corresponding direction in the channel 3 in different positions relative to the tool-post. Where a tool-post is used on the rear of the carriage,'obviously it feeds in the opposite direction in working from tool-post 2. 2O represents a gage-screw shaft for such rear tool-post. It has similar knurl and gage arrangement 21 on the front of the carriage. The rear tool-post carries the sleeve-nut 22, which travels toward the rear end of the sleeve-nut 23 to stop the toolpost, as indicated in Fig. 5.

vcare and accuracy.

In operation say a t\voinch-diameter work is between spindles and the job is to cut it down to one and seven-eighths inches. In one way of using' the gage the operator feeds the tool-post inward until the tool contacts the work and then turns the knurl 11, so as to add one-eighth of an inch to the fraction indicated by the gage 1a at the point of toolcontact with the work. Vv'hen the tool is fed in one-eighth of an inch, the sleeve 16, carried b v the tool-post, will come to a bearing against the front end of the screw or stopslecve 18, and manifestly the tool-post can'- not be fed into beyond this point. Another equivalent use of the gage is to adjust the toolpost by means of the cross feed-screw and to adjust the stopwsleeve 18, by means of the knurl 11, until the sleeves 18 and 16 have come to a bearing with the register indicating zero and the tool as close to the work as is possible with such adjustment. Assuming the work is two inches in diameter, to be turned to one and seven-eighths, and that the cross Yfeed-screw 4: shows the tool-post to be two and an eighth inch from the center when the iliametergagc registers Zero, manifestly the tool-post will have to be fed in a quarter of an inch to reduce the job to the diameter of one and seven-cighths. Therefore the diameter-gage will be turned to indicate a tool travel of one-miarter of an inch. This saves work, because the operator will not have to use his calipers at frequent intervals. It also gives great precision, as the result does not depend upon the proficiency of the particular workman in measuring-and upon his constant The operator sets the gage to cnt the diameter, and the tool-post will come to a stop precisely at the predetermined diameter.

Ilaving described my invention, I claim4 1. In combination with the carriage, toolpost and cross-feed of a machine of the class. described, a screw-shaft journaled on the carriage against longitudinal movement, the toolpost being provided with a channel into which the screw-shaft projects, an interiorly-thread- E ed stop-sleeve mounted to slide in the toolpost channel without rotation, the said screwsha'ft engaging through the said stop-sleeve,

a cooperating stop on the tool-post adapted to f engage against the sleevc-stop in the channel and limit the feed of the tool-post and a gage on the screw-sliarft, substantially as described.

Q. ln combination with the carriage, toolpost and cross-feed of a machine of the class described` a screw-shaft on the carriage taking into the tool-post, a stop-sleeve in the toolpost adapted to slide therein without rotation having an interior screw-threaded engagement with the screw-shaft, and a cooperating stop on the tool-post, whereby the stop-sleeve may be adjusted to a predetermined point by rotating the screw-shaft to limit the feed of the tool-post, substantially as described.

3. In combination with the carriage, toolpost and cross-feed of a machine of the class described, the tool-post being provided with a channel, a screw-shaft journaled on the front of the carriage and held against longitudinal movement, a stop-sleeve within said channel having a keyed engagement therewith permitting of longitudinal adjustment without rotation, said shaft having screw-threaded engagement with the interior of the stop-sleeve, a cor'perating stop on the tool-post, a gage on the front end of the screw-shaft, and an indicator for the gage, substantially as described.

1I. In combination with the carriage, toolpost and cross-feed of the machine of the class described, the tool-post being provided with a channel in the direction of feed, a screwshaft 'journaled on the front of the carriage and held against longitudinal movement, a stop-sleeve within said channel having a keyed engagement therewith permitting of longitudinal adjustment without rotation,sa.id shaft having screw-tlneaded engagement with the interior of the stop-sleeve, a cooperating stop on the tool-post', a boss on the end of the screwshaft forming a sliding bearing with the toolpost channel, a gage and knurl on the front 1 end of the screw-shaft, and an indicator for the gage, substantially as described.

5. In combination with the carriage, and transverse way thereof, a tool-post mounted upon the front, a tool-post mounted on the rear of said way, means for feeding said toolposts, each tool-post being provided with a channel in the direction of feed, a screw-shaft jou rnaled on the front of the carriage, a stopsleeve in the channel of the vfront tool-post mounted to slide therein without rotation, the said screw-shaft having' a screw-threaded cngagement with the interior of said sleeve, a cooperating stop on the front side of the front tool-post, a parallel screw-shaft passing' the front tool-post and taking into the channel of the second tool-post, a stop-sleeve within the channel-of the second tool-post, mounted to slide therein without rotation, the said second screw-shaft having screwthreaded eni gagement with the interior of said second stopsleeve, a cooperating stop on the second toolpost in rear of its stop-sleeve and devices on the front ends of said screw-shafts, substantially as described.

In witness whereof l have hereunto set my hand.

NICHOLAS D. CHARD.

Witnesses:

OLIVER B. KAIsnR, Luo ODONNELL.

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